Omega no Tadashii Seifukuhou

"I want to be raped by you, the alpha's bare instincts."

An omega Otonashi has a desire to be raped by an alpha. One day, when he is about to be attacked after taking a pseudo heat potion, he is saved by Masaki, who is also a student at the university. Otonashi wished Masaki would rape him instead, but Masaki is a very sincere and earnest man who is well-known at the university. He is an alpha, but he doesn't seem to respond to Otonashi's pheromones. Otonashi is about to give up and say that today was not his lucky day, but then he notices that Masaki has an erection even though and he is only holding back...

(Source: Kasakura, translated)

Note: Includes one extra chapter.