@lilli
I may know these stories:
a) Sub-sama, Shitsuke no Jikan desu (It's Time for Your Obedience Training, My Subservient Pet / Sabsama Shitsukeno Jikandesu)
b) Taikingo, Usaka san wo Nuga Shitara - Tsundere-senpai no Ecchi na Himitsu (What if I Undress Usaka After Work…? ~My Hot and Cold Superior's Dirty Secret)
c) Yarashiku Shitsuke Kete Itoshite Ageru -Dom/Sub Universe-(I'll Train You Sexually and Love You -Dom/Sub Universe- / I'll Train You Sexually, And Love You.)