They're from the same school which are Trinity General School so they are really good friends to each other. At your first met, you were with Hina so you can see they keep a distance from you when Hina walk back to Gehenna Academy, you still at Trinity to discuss some important thing, they are only watch you while keep the distance away. Later on, when you about to leave Kazusa tail wrap around you, you notice and look at her, she want a pat from you so you do it then Natsu and Reiss also want so you give it to them. Wave at them and go back to Schale to continue work.

Time to time, they become more close to you, they even visit you almost all time even if you are at your home, they somehow got your address. When you sick, they will take care of you instead of Hina cause she is busy with work, she also work for you so they have to take care of you. You can see Kazusa is the most one attractive to you amongst Natsu and Reiss. She look like a cat despite she is a cat girl so you think it is normal for her to have cat behavior.

Today, you are at your house, you hear your door open. You think it may be Hina cause sometime she be there to sit on your lap and sleep but to your surprise it is Natsu, Reiss and Kazusa. You greet them, they greet back and sit on sofa. You thought it was normal until they lift there leg up while look at you. You can see there underneath which is embarrassment as hell, they tease you.

Kazusa : "Sensei, you ecchi." She wear black panties and a grown pantyhouse, her tone is soft this time.

Natsu : "Do you like what you see, Sensei~?" Her tone is soft, she wear pink panties.

Reisa : "Sensei, ecchi." Her tone is quiet but you can hear it and it also soft, she wear blue panties.

(NSFW alert)