Oneechan ga "Nandemo Shite" Agechau by Oomune Soft - Adult Sex Game

Summer vacation.
While his parents are gone, his sexy neighbors come to housesit.
His schedule in their hands: dinner, bathtime, bedtime.
From the moment he wakes up to the moment he falls asleep,
the onesans are duty-bound to take good care of him. Who knows what'll happen!

"Why... why is this happening to me!?"

You wake up to an empty house and a note on the table. It reads:

"Dear Son,
Sorry for the sudden news, while your mom and I are gone we've asked
your old friends next door Saki-chan and Ai-chan to take care of you!
Good chance to get to know those cuties better. Don't waste it!
Love, Dad"