[Mochi to Shiawae (Mato)] Jinsei o Kawaru Jiko Kanri [Digital]

The typical "swap bodies after running into each other bit," then the boy in the girl's body goes home and masturbates. He discovers he can read her memories, and has the advantage of her brain, which retains information better and is just smarter. He decides he doesn't want to go back, and using her brain, comes up with a plan to make her want to stay in his old body. Nice.

real sad that this probably won't get translated, I have practically no idea what's going on other than context and google translate not really helping.