Itsuki: Onsen Retreat (Patreon)

Uesugi and Itsuki win lottery tickets to a couples-only spa retreat in the mountains! Uesugi can't bring himself to turn down a free trip, and Itsuki wants the chance to get closer to Uesugi! What could possibly happen between these two alone in the mountains... and why are all the onsen baths mixed-gender only?!