Drugged, Confined, and Violated By Your Cute Kohai

[Story]
You're an office worker who has been tasked with working on a special project with Seiji, the young, hot ace who's been turning heads ever since he arrived. It's been a month, and things are progressing well, until you suddenly come down with something, and end up having to leave the team to recover.

Seiji comes to your house to take care of you, and you're thankful.
However, the reason you don't seem to be getting any better is that Seiji is drugging you. By the time you realize it, you're already too weak to resist him as he makes you his own, then r*pes and confines you!? You desperately try to think of ways to escape your situation, but perhaps the pleasure will become too much to handle...!

[Character]
Seiji Mura (26)
Height: 168cm
A smart and handsome office worker who is the talk of the company.
His feelings of affection for you change to those of possessive obsession, and he decides to concoct a plan to confine you.

You
A brilliant and talented office worker tat's won the trust of everyone around you.
After working with Seiji for a month, you've developed some feelings for him.