Body Swap Me!

"Want to experience sex as a girl? This app allows you to swap bodies with members of the opposite sex... Users can access our matching services and utilize the body swap feature together with a consenting partner..."
And with that, Saejima signs up in a heartbeat, only to discover that the person he's matched up with just so happens to be another girl in his school..."
(Source: Irodori Comics)

Note: Published in Comic Market 96