nipple stimulation

Any stimulation of the nipples.

Subtypes:

• nipple_tweak
• nipple_pull
• nipple_rub
• nipple_torture
• nipple_biting
• nipple_flick
• nipple_press
• nipple_push
• nipple_injection
• nipple_fingering
• licking_nipple
• vibrator_on_nipple