Having sex with my girlfriend and masturbating my sister-in-

This was last night I was with my partner, my sister-in-law, and a friend celebrating the 28th birthday of my sister-in-law who hadn't had sex for some time and we'd taken too much to drink once it was over we decided to go to bed already I was hot so I went to sleep with my partner. And my sister-in-law was very drunk she went to the bathroom and this friend followed her from behind you could hear her moaning in the bathroom that made me even hotter so I gave my partner a little kiss and suddenly my sister-in-law came into our bed, turned around facing me, pretended to be sleeping, moved her arm towards me and grabbed my hand and put her breasts against it uff it felt good but soon my partner suspected something and stopped and turned over giving me her butt without thinking I stuck my hand through her pants and reached her recently fucked and still wet vagina when that happened my partner grabbed my penis and introduced it into her vagina without realizing that while she was penetrating me, I was masturbating her sister by pushing my fingers into her moist vagina she got very hot and even started moaning softly and pulling her butt towards my fingers after that I let my partner penetrate me and took out the wet fingers from my sister-in-law's vagina and turned around facing her. She stretched out her arms and caressed my penis thought it was going to suck me but it wasn't so my partner woke up and ruined everything but I know she'll get hotter later and I'll be able to take her pictures and video for my next post if you liked my story let me know.