I went to my brother's house as a guest and sneaked into his room in the middle of the night to have sex with his wife. I put a condom on my penis and thrust in from the side, it was so exciting and pleasurable.

The protagonist is invited to his brother's house. Late at night, he sneaks into his brother's wife's room, where the two engage in intense and secret sexual intercourse. The male protagonist wears a condom and thrusts vigorously from the side, bringing extreme stimulation and pleasure. The entire process is filled with taboo and excitement.