I (22M) was in my girl’s room (22F) with her and we were teasing each other. Her parents weren’t at home but her younger sister (19F) was in her own room.
My girl and Me, we both thought the door is locked but it wasn’t. We started with kissing each other, kissing her neck and then me playing with her boobies.
We could hear the younger sister walking outside the door but we didn’t care because she knew we were in there and we thought the door is locked.
My girl pushed me and I was sitting on bed with my back against the wall, legs apart, she bent down towards my dick with her ass up. She unbuttoned my pant and started rubbing it off with her hands. After a bit I grabbed my dick and put it in her mouth, and slide my hand in her shorts to grab her ass.
She was giving me the sloppiest blowjob, my dick totally covered in her saliva as she is fully focused into sucking my dick and running her tongue all over and my hand in her shorts on her ass crack and my middle finger on her butthole. My face was towards the door.
And then the younger sister walked in without making much noise. I could see her eyes looking at my hard dick to realising how big of a slut her sister is and finally we making a eye contact while her mouth is open from shock. It took my girl atleast 4-5 seconds to realise and see her younger sister is watching her deep throating me.
She shouts at the younger sis so loudly, makes her go away and locks the door. She wasnt ready to continue but i somehow convinced her to suck me off again. I was the hardest ever, I never had any wrong thoughts about the younger one but right then all I could think was she giving me this blow job while my hands grab her little boobies. My eyes were closed and I gave a big fat load of my cum all over her sister (my girl’s) face and mouth.
I know it sounds wrong but comment WOULDN’T YOU DO THE SAME?