I was playing games at home with a friend and his girlfriend. She's cute and a good girl, and seeing them as a friendly couple made me jealous. However, after watching for a while, I noticed that my friend was treating her quite roughly. Hmph... what a sinful guy. Moreover, he left her to go to work. Alone with her, she started consulting me about her love troubles. To avoid ruining their relationship, I gave her vague answers, but more than her problems, I couldn't stop noticing her panties peeking out...! I ended up getting an erection from the panty shot and impulsively had sex with my friend's girlfriend, impregnating her!
