My senior colleague is a capable but loud girl. She and her tough-looking boyfriend started flirting right in front of me. It got awkward, so the perverted boyfriend said, "Why don't you try it too? (laughs)" I hesitantly inserted my penis and came almost immediately. Afterwards, when we were alone, my erection didn't subside, so I inserted it again (by force). I was more experienced with my thrusting than before, and she came so hard that I got excited and came inside her vagina.