I Slept With My Childhood Friend Whom I Had A Crush On

“I think I like someone.”
My first crush and childhood friend, and the sub-male lead in this novel. In the summer, Hares confided a secret to me. A period(.) that would bring an eternal end to my long-time unrequited love.
Honestly, I had almost given up. The sub-male lead existed only for the female protagonist, so there was no way it could work out between us. Just as I resigned myself to that fact, though…
“Well, what do you think of us cooperating?”
I made an alliance with the male protagonist, a psychopath, who was also eyeing the female lead. But I never expected that this seemingly innocent alliance would turn into something this big.
“What kind of nonsense is that? For that stray dog, Rize Chelsea, to become my interest? That would be very unfortunate for her.”
Thanks to that (?), the male protagonist’s obsession with the female lead was directed towards me instead.
“You confess to me first and then play around with that b*stard?  I’ll chase after you till the end.”
Now, my childhood friend, who should like the female lead, was demanding that I take responsibility because he spent the night with me! I just wanted to make my unrequited love come true, but how did it turn out like this?!