I Made the Girl I Liked My Maid, and Now She’s Secretly Doing Something in My Room (LN)

I tried hiring my poor classmate. This maid is a little suspicious!?
Kiyomiya Keiji is the only son of a distinguished, prestigious family. But due to circumstances, he can’t inherit the family, and he was enjoying living alone in a separate residence. One day, the honors student Hisaka Sayaka, who is even respected by her upper-class classmates, shows up at his door in a maid uniform.
“Even I’m not so much of a s*um to hire a classmate with money.”
“If you don’t hire me, a homeless girl in a maid uniform will be born.”
“So I’m s*um even if I refuse!?”
“If you do it now, the ‘service’ you’re hoping for will also be included.”
“…”
“Ah, you wavered a little.”
My sanity can’t handle living under the same roof with a girl I secretly have a crush on!
But what is Sayaka doing, occasionally rummaging through my room?