what is this manga

Im going crazy cause I can't remember the name
What is that manga with the black haired girl who likes being dominant and she has a relationship with two submissive boys one blonde and one with brown hair. She like uses strap ons with them lmao and the blonde boy is new in the relationship and was too scared to take it in the ass the first time. They're in college and the brown haired boy was already with the black haired girl before the blonde hair boy. Theres also a blonde haired girl who has a crush on the brown haired boy that joined in on all of their wacko relationship. SORRY IF THIS SOUNDS SO CONFUSINGGG