Sodo:
- starts purring, wagging his tail, and blushing behind his mask
- once you see him staring at you with his tail wagging he'll tell you to continue and hug you
- plays his guitar while you sing
Mountain:
- blushes A LOT
- compliments you on how good you sound while he wags his tail and stutters out the compliment
- lays down near you because your singing helps him sleep
Swiss:
-gets really cocky and flirts with you a ton afterwards
- tells you to continue while he dances with you
- teases you as you sing
Aether:
- gets caught off guard but still can't help but blush bright red under his mask
- sits by you just to listen to you
- compliments you and wants you to continue singing
Rain:
- poor baby doesn't know what to do
- he's a blushing mess, he can't help but purr at the sound of your voice, and his tail is instinctively wagging behind him
- gets even more shy when you see him watching and listening to your movements and voice
Papa iii:
- blushes and tells you how good you sound
- sings with you and starts dancing with you as you sing
- compliments you and gives you a hug and a kiss on the forehead afterwards