This VN contains at least one sexual scenes where a character engages in a non-penetrative sexual act called ball-cupping.
Ball-cupping is a sexual practice similar to a handjob except instead of using a hand to stimulate the shaft of the penis, a hand is used to stimulate the scrotum (ballsack) containing the testicles.
NSFW Example 1
NSFW Example 2
NSFW Example 3