I'll Pop Your Cherry!

Yaguchi and Kimika have been crushing on each other since high school. Now they're in college, and they still haven't worked up the nerve to ask each other out. Their friends are all teasing them to get together already, but a curvy older girl with a thing for virgin boys is watching them from the sidelines, and she's about to go in for the kill...

(Source: Irodori Comics)

Note: Released at Comiket 105.