phantom masturbation
When a character is masturbating with a sex toy, typically a strapon, as if it were their own genitals.
Unlike traditional masturbation, the character is substituting their genitals for the sex toy, and thus derives no physical stimulation from it. Hence the term "phantom."
This is typically common with characters that are in chastity.
In the event of orgasm, this is considered hands-free since the character never actually touches their genitals.