How they would react?! If..
You kissed them!
Gyutaro: Shocked but.. now you're stuck with him and have 1000 kids with him. (on the lips)
Tamayo: You kissed her on the cheek and she gave you a warm hug. (on the cheek)
Rengoku: blushed but smiled. (on the lips)
Kagaya: you kissed his hand and he smiled softly at your manners. (on the hand)
Enmu: Surprisingly blushed but smirked and kissed you back. (on the lips)
Rui: you kissed him on the forehead and now he calls you: 'nee-san'. (on the forehead)
Nakime: smirked and played a soft tune on the biwa for you. (on the cheek)
Kokushibo: was shocked since you decided to randomly kiss him and then you ran off and childishly giggled: 'Hehe'. (on the cheek)
Gyomei: He didn't realize at first but kissed you back when he realized you kissed him. (on the lips)
Mitsuri: You were just respecting your elders and kissed Mitsuri on her hand but she blushed and was gushing all over you. (on the hand)
Tanjiro: You two were watching the moon and your hands found his and connected. Then, you kissed him and he kissed you back. (on the lips)
Daki: Very shocked when you kissed her hand, but showed some respect to you and didn't act like a brat like she does with most people. (On the hand)
Akaza: Kissed you back immediately. (on the lips)
Muzan: didn't give a reaction when you kissed him on his hand but gave you much more respect. (on the hand)