Eine party kommt so unerwartet

The weather was pretty damn bad that evening. The guy's girlfriend was at home alone, doing nothing. Then surprise, her partner's parents came to visit. She plays it nice and offers them towels and some hot drinks. Everybody's having a good time and they want to keep going. Then her boyfriend shows up, and they send him out to get some food. Right after that, well, you can imagine. A crazy threesome commences! Their stepson sent a friend to bring them the food, paying a visit to his lover instead. His buddy comes and everybody starts having an even better time!