As Drake's 3 siblings fought over the remote he directed the sensation towards his older sister's shirt which disappeared completely. During the tussle none of the three didn't notice as they were concentrated on the remote, but as the little brother's "accidentally" bumped into their older sister's breasts they started to merge with her boobs. As Mike and Leo's flesh became Denise's their arms melted into their bodies which were becoming fatter and squishier as their organs and bones became breast flesh. Denise saw in horror as her younger brothers were turning into her breasts and she started to feel them. Their heartbeats in her breasts which then silenced as some of their most important organs turned to boob. As the legs of the brothers shrank in, and the boob took shake their shorts fell off revealing to Drake their dicks were starting to turn into nipples. Drake also noticed that his little brother's shirts were still on them... well kinda stuck on the middle of Denise's new tits. Drake used his new power to take the fabric and reknit them into a new bra.
Drake was smirking with his new powers and felt a boner as he thought of what he'd do next.