Night Shift NTR

Hiroki's been going steady with his high school sweetheart Madoka ever since they graduated, but he can't seem to work up the courage to go all the way. He's hoping his big chance will be the college summer vacation they're saving up for, and suggests Madoka takes a job at the burger joint where he works to help get funds. She agrees, but ends up catching the eye of their manager, who's well aware of Hiroki's hesitation... and hey, that cherry's not gonna pop itself.

(Source: Irodori Comics)