We had kicked around the concerns we both had about how such an act could damage them, yet agreeing that the idea was extremely exciting. I had told h...r about how I had found out that my own son had been jerking off into my underwear and catching glimpses of me naked at every opportunity. We had agreed that we would try to "feel them out" on the subject if an opportunity arose.Brandon was fully hard now and I was moaning regularly as I slid my hungry lips up and down the length of his shaft. I. Its Brians turn now, Todd said. Brian looked shocked. Dude, shes my sister! Step-sister, Todd and I both said almost simultaneously. Before he could protest anymore, I moved in front of him and took his cock in my hand, stroking a bit before taking it into my mouth. As I started to suck him, Todd moved onto the floor next to me and pulled my camisole up over my tits. I was an early developer, so even though I was just going to be starting high school in the fall, I was already a C-cup. Oh my. I could literally feel the blood rushing to my cock, and the inside of my thighs was immediately damp."Ok, you had better stop now, its getting me too worked up"She looked down."So that is the culprit" She took my rapidly hardening dick in her hands, taking both to fully circle it, slowly exploring it. As she ran her hands over the tip, my pre-cum immediately drenched her fingers. With that she let go and licked her fingers off, never breaking eye-contact with me."I think I found what I'm. Irene was already in her bed and I just could not tell if she was facing towards the wall or the bathroom; looking at me. I just walked to my bed, separated the towel off me and yanked it towards the chair and got under the sheet, where I thought for a moment but figured out that it would be just very risky if I took my underwear off before sleeping. I had been sleeping naked for long now but just thought to be safe than sorry and hoped not to be awake due to the restraining tightness of.