During the night cuddled up with ex sis in law, she had a nightmare. I woke her from it as best I could but it was still startling for her and she turned from being spooned against my front to facing me. She was pressing in very tightly and once she was awake I got her to tell me what it was about. She would not tell me but stayed tight in against me and without thinking I just talked to her softly and told her I loved her and that she was safe. But since we are sleeping together platonically but both find it more natural to sleep naked, our platonic solution has been that I sleep in snug underwear and she sleeps in p****** and a tank or a sports bra. Holding her tightly to me and the scent and warmth of her in my arms had me painfully erect and bent down in my underwear between us. I was gently stroking her bare shoulders pulling her in tight and by instinct my hand went to the small of her back and i felt bare skin. She murmured and squirmed in my arms and pressed in even more tightly. When she realized what she was feeling against her stomach her hand went briefly to the front of my underwear as she confirmed what she was feeling. Her hand did not move and I was about to lose mg mind but clung to platonic sanity and did not go with what I wanted. She buried her face in my neck and said she was sorry that I was so wound up and that she could not give me what I wanted. I felt her hand tighten slightly as she still gripped me and she squirmed and moaned softly. Said that she was sorry again and to please not think she did not feel safe with me. Her hand left my groin, came back briefly, and left again. Her breath and panting on my neck was killing me. I moved away from her, sliding up higher in the bed, and she clung to me asking me to please keep holding her tightly. I told her if she truly felt safe then she needed to trust me. I put a pillow level with my chest and had her lay on her side still facing me, and put my hand on the back of her head pressing her face into my chest. She kissed my bare chest and briefly licked my skin. I am in good but not great shaoe, a little soft, and I told her to open het mouth, she did so and I pulled her open mouth directly onto my n*****. In the dim light I saw her eyes widen but she could not stop herself from gently suckling. She whimpered and began to do so more strongly and i felt her teeth sink in gently. An intoxicating shock ran thru me and I pulled her in tightly. She was breathless and stopped and gasped and looked up at me and I told her to let herself have it, it would be fine. It was non stop rapture to feel her latched on and suckling. I had no words for it but it was very emotional and sheer bliss to nurture her this way. She slowly began to increase in how she did it and was eventually throwing a leg over my hip and began to slowly grind her p**** clad hips against me. I bent my knee and gently moved my leg forward and she immediately began to grind against me. It was getting heated and i felt her teeth sinking into my chest around my n*****, and I knew it was going too far for her, especially when her hand snaked down between us and clamped onto my aching erection, still trapped and pointing down in my underwear, a slow blend of cupping and squeezing and long slow fingertip strokes of the entire hard length of me. But I did not want this to violate her feeling of safety so I gently took her hand off me. She broke off my n***** and said please, but I pulled her back onto my n***** and placed her hand down to the waistband of her p******. She stiffened for a moment but realized I was giving her my blessing, and her hand slid down into her p******, where I felt it moving as she masturbated while latched onto my n***** and i felt the hot slick wetness soaking thru her p****** on my peg. Soon she was whimpering and moaning non stop on my n***** and her teeth sank in painfully and I moaned to her yes, that’s it, let yourself c**, and her body was shaking violently as she came, biting harder into my chest and almost screaming as she sucked hard and long thru it, her breathe hissing loudly thru her nostrils. She eventually broke off the latch amd gasped and only muttered “f***” a few times as i just held her tightly and stroked her hair and cheek. When her breathing slowed she stroked a fingertip and said she had probably left a hell of a mark around my n***** and I told her I would spank her for it later. She laughed and stayed warm in my arms. She said my name once as she started to speak and I told her to please shut up, nothing needed to be said now. She asked if we could trade sides of the bed and asked if she coild latch onto the other n***** and I gladly let her. She drifted off eventually and I simply savored all of it while I kept her warm and safe, realizing that I would go without s** gladly if she would spend every night like this. When she did wake or stir, she simply latched back on again. When we got up the next morning she asked if we could shower, and get something to eat, and we were still just talking generally, but when we went to watch movies on the sofa she stretched out across my lap, her arm went around my neck, and she latched on again as I cradled her closely and nurtured her. This was slower and gentler, but still arousing, and we both left unspoken the fact that we were both soaking our underwear as we drifted in this perfect place we had discovered.