This character is involved in sexual activities while being tied or sitting on a sex swing.

A sex swing (also known as a sling) is a type of bondage harness designed to allow sexual intercourse between one partner suspended by the swing and another who moves freely. Though there is considerable variety in the design, the most common sex swings have a support for the back, another for the buttocks, and stirrups for each leg, which can be adjusted whilst the user is suspended.

NSFW Example