It's the frilly pink apron's fault, really.
Daisuke isn't normally one to fall for mushy, romantic scenes, including outfits, but this one was different. It was frilly, and pink, and girly, and most importantly, it was on Takeru. And Takeru was blushing bright red when Daisuke saw him, and standing in the kitchen looking like a fourteen-year-old virgin in a frilly pink apron.
He could have just as easily blamed it on Takeru as the apron, but since the apron is what drove him over the edge and caused him to pounce on Takeru and have sex with him in the middle of the kitchen, he didn't.