Since it's half of Youmu, it may be expressing her hidden desires.
*flop*Ooooh*temble**ta-daa**spit**splish**splash*Anyway, you just make yourself at home!?Ah! Hey, wait, you...!!*throb, throb*H-Hey! Seriously, what kind of things do you think you're bringing here...!?What the hell are you bringing over here!!?I-I... I'm sorry. I'll j-just get another...!It'll be all right this time, so relax!Placement.Gyah— Wait, this is Yuyuko-sama's!!?That was embarrassing!Wha— Gyah! H-H-How did my underwear-!!?