A heterosexual couple is having sex. When both are close to orgasm, something is happening and they realize that they will have to stop their fun. . Their excitement pushes them to continue at all costs. Despite the great desire, at some point, they are forced to stop. It turns out that the last movement of the partner (the pulling out of the penis if they are in a missionary position or doggystyle) or lifting of the female body (if she rides) starts an orgasm for one of the participants, while the other remains on the brink of their orgasm.
Possible situations
First - Travel on a train between the towns. Quick sex in the toilet. Unexpected stop of the train. The compulsion to stop is when they hear passengers coming out of the train compartments.
Second - a cheating couple in a house with a large yard and garden in it. They hear the husband/wife coming home by car. The wife/husband says "She usually uses the bathroom downstairs first. We have time to finish our fun." The compulsion to stop is when they hear unexpected coming out from the bathroom.
Possible situations
First - Travel on a train between the towns. Quick sex in the toilet. Unexpected stop of the train. The compulsion to stop is when they hear passengers coming out of the train compartments.
Second - a cheating couple in a house with a large yard and garden in it. They hear the husband/wife coming home by car. The wife/husband says "She usually uses the bathroom downstairs first. We have time to finish our fun." The compulsion to stop is when they hear unexpected coming out from the bathroom.