Yes, the succubus swears to be Mary's

You take your foot away from her mouth and remove your sword from the succubus's belly. You walked over to your bag, took out your medical supplies and started treating your captive's wound. It took awhile, but your incantations were working, her wound was slowly closing. The succubus was **** while her wound was healing, so you decided to tie her to your bed in a star fish pose. About 1 hour passes and you check on her again, she was starting to come awake this time. You climbed onto the bed and stood over her with your feet on either side of her face. The succubus struggled lightly for a small bit before giving up. After she gave up, you giggled and said "There is one way I will let you out..."

"P-please? I-I'll do anything f-for you Mary! I-I'll lick your f-feet for as l-long as you like!" The succubus pleaded

"A tempting offer succubus! But I have something different in mind." You hover your one foot above the succubus's face and say "Swear to be my **** and serve my needs for eternity, or else I will leave you tied up here for all eternity!" You giggled after saying that.

The succubus's eyes started glowing red, she was muttering an incantation. When she finished her incantation she reached up with her head and gave a long loving kiss on the middle of your sole. The succubus started crying properly now. You knew she actually submitted to you.

"What is your name ****?"

"Rebecca *sob* mistress *sob* *sob*"