Sabaku no Ryoshuu

This is the story about one man who truly is a hard-working horse. A beautiful young woman is his partner. She's a sucker for his body and has a desire to have fun. However, she appears to be a bit confused by her feelings. He's not trying to trick her into the romance. In fact, she's been in love with another man. She tells him that she is happy for his friend and would love to visit him again. His friend then gives him a sexual partner.