Well, nature being what it is, Brenda and I were downstairs having sex on her sofa bed. I had persuaded Brenda to get on top as I enjoyed her riding m..., it meant I could feel her breasts and nibble nipples whilst manipulating any fingers I'd managed to inserted into her anus.Although it was a very slight noise, we both heard it. Doreen, having come downstairs without us hearing her, was watching us and what she saw had aroused her to the point that she'd removed the pyjama's that Brenda had. The two women could see that the boys were affected by their presence. They noticed that they were becoming erect as they buttoned their pants and pulled up the zippers. The boys put on the white shirts and wrapped the ties around their necks.Jack and Tom fumbled with the ties, neither one sure how to tie them. Marge and Anne laughed as they watched the boys struggle with the thin strips of material."Let us help you guys." Marge said.Anne added, "You two are just like your fathers. They can't. “What are you doing, you sick bastard Ken?” “Nothing I’m sorry”. I quickly made my way inside keeping a low profile. I found the toilet and opened the door. I looked down and saw my penis had stiffened considerably. I sat down onto the toilet and starting to stroke myself. “Are you in there ken”? I heard a voice from outside the door. I was startled and quickly covered up. “What’s wrong”? I replied. “Can we talk”? Emma’s soft voice breaking as she enquired. I pulled myself from the toilet and. This however, was an opportunity I could not turn down. I've condensed sections of this in to separate days, so you get a sense of how long this has build up.It all started when I began classes at my college, there was a younger guy just turned 18. He's NEVER admitted to being gay, I honestly think he just wanted to cum so bad he'd let anyone do it because he can't 'figure it out' I was amazed that in this day and age that a guy can't figure out how to cum! Anyway this guy had a sexy sister.