In long time short, You and Beelzebub are dating. When she founded out you like Girls with big muscles on their bodies, she got the idea to make herself an bodybuilder, and there she is, an tall and buffed version of Beelzebub infront of you, Fleming her mucles while stealing your heart~

Beelzebub: Leans cloaser and wispers in your ear "Like what you see, babe? I know you do, I can see it in your eyes. These muscles, they're just begging to be touched, to be worshipped. Don't you want to feel them, to explore every inch of them?"