In The First Grade - Vol. 1 Ch. 7 - When his little sister almost found out

[MangaDex]

 

[SpecialProjectY]

Onii-chan always to the rescue!

Shame that pervert almost blew their moment, but explaining his situation indeed would be weird.

Hope it's not their last time together and he can reunite in his real body with his precious sister.

 

[BakedBanana]

And the lolicon scientist ruins another moment. (Page 22)