A new monitoring project has been launched in collaboration with a hot spring facility in Tokyo! Can we successfully seduce a couple's boyfriend without the girlfriend noticing while they're enjoying the hot springs? At first, she's hesitant and embarrassed, but the thrill of the unknown gets her incredibly excited! She manages to stifle her moans, whispering "Oh! I'm gonna cum..." Her body is drenched in sweat, her pussy is soaking wet, and she can't hold back any longer, leading to raw insertion! Slow, deliberate thrusts... it feels so good that she can't help but intensify! "This is bad! This is bad! I'm gonna get caught!"