Sex at a young age has its joyous aspects: beautiful bodies in two partners, great looseness, willingness to help, even in the matter of relieving sexual tension. The sister saw her brother's hard-on, a drop in spirits, and so she decided to suck and let him fondle her. Finally aroused, they began to fuck right in the kitchen in different positions.
The guys immediately realized that the chick sucked on the car, so their offer to give her a ride home and pay with sex did not cause her surprise. Indeed, why not thank the guys with what she has between her legs for free!