I was fingering my girlfriend at her house this evening, and then we got interrupted. Her 14 year old brother came home, walked in (fortunately didn't see us up to anything) and then just came in sat down in the front room and started talking and watching tv with us.
As he goes to leave the room he gestures for to me for me to fist bump him, and I did because it would have been rude and suspicious not too, but I was also aware that my fingers were covered in his sisters cum, and my girlfriend was currently sitting on my other hand.
My girlfriend saw and said she felt sick afterwards, knowing that her brother had came into contact with her cum.
