Because the drunk teen chick could not defend herself against the horny scumbags, they started groping her body and even took off her bra so to play with those nice tits until they started touching the babe's pussy as well.
Original upload was here https://www.xrares.com/video/21599/asian-bullies
(My version is slightly longer and what I managed to piece out). It is also 10 seconds longer than original video uploaded by 10seconds at the end.