I can make it so you never...
I can make it so you never come again - frustratum foreverum - a simple spell that locks away your orgasms beyond reach.
Another spell - arousium eternia - will tease your cock with constant, mind-blowing arousal.
Watching you writhe with no hope of release makes we wet. Perhaps my final spell should be - pussium cravum - you need to eat me out as much as you need to breathe.
You wanted something magical for your birthday, hubby. I hope you like it.