There's fucking instructions on how to getcha a good rape victim!
Numbers 17-18 (paraphrased):
"1.Kill all the men and boys. 2. Kill all the women who has had sex with a man. 3. Kidnap the remaining women and girls that are still virgins, and take them for yourselves as wives."
Judges 21:20-23 (again, paraphrased):
"Go stalk and hide in the places where young women do their traditional dances. When they come out to dance, catch and kidnap one for yourself and take her as your wife. When their male family members protest, tell them that the men should actually be helping you to steal their daughters and sisters because you didn't didnt manage to get any in the war, so you need these girls. Tell them it's fine, they don't have to be guilty, because they didn't actually offer them the girls themselves.
And they did that, kidnapped the young women, and returned home with them."
For context on this one, there was a place that most isrealites deemed too sinful to exist, like Sodom, so they decided to do a genocide on it. But one tribe refused to do said genocide, and stood against the rest of the tribes. All of that tribe were then killed except 600 men by the rest of the Isrealites.
But that left those 600 men without wives, and they were still the chosen people. So, while the rest of Isreal swore to never let their daughters marry someone from that tribe, they still decided to help get them replacement wives.... with another genocide. When another tribe failed to join their war coalition, they went and killed everyone there except the virgin girls, around 400 of them. Then gave the wifeless tribe the above instructions.
What makes this story extra shitty is the entire reason for the original genocide was because one group of men raped and murdered one woman. While that it abhorrent, they then corrected this crime with at least 400 rapes and tens of thousands of murders. Yaaaaay. Much better. Thanks, The Bible!
That shit is in the fucking Bible. Read those passages for the direct translations without my paraphrasing, if you like. It doesn't get any better.
Does it have to be an individual fey? Could it be an entire coven? Could be interesting to have your warlock be the charge of, say, the Hourglass Coven. They each distrust each other and want to get one up on the others all the time, so they could each be using you to fuck with the other two all the time, essentially giving you carte blanche to do as you want as long as you are constantly a thorn in the side of all 3.
Could even flavor your spells to take on the aspects/traits of one of the three, like that individual hag has given you that specific spell. Divination and control magic from Endelyn with something like suggestion or hold person controllingthrough puppet strings. Skabatha can give you summoning spells and enlarge/reduce with all effects appearing like wood carved toys. Bavlorna gives you all necrotic magic and polymorph with the forms they take looking like stitched together Frankenstein-esque monstrosities.
Or maybe your Patron is specifically Baba Yaga, but she tasks you with being the Hourgalss Coven's errand boy while also being her eyes and ears on her daughters' activities.