If you understand its mechanic and only chose the easier option (Fellatio) and know the place to exercise prostitution, you're gonna be golden.
Yes, it syncs well enough, foods from begging will keep you going. Better take dark cauldron too.
This is where you learn to position your companions to your advantages, it's formation time.
Spear formation
View attachment 1088009
This way Grey Rat tank the damage while Cecily help attacking from behind by throwing daggers. Cecily gonna take damage from spears attack like this, this formation is usable, but not recommended. You can help out by using bow,whip, musket or magic to attack from the side. Just hit them hard and fast to stunlock them and Cecily's gonna be fine. (Whip, wall of fire and Arrow rains recommended)
However, if you aren't fast enough after luring enemies, Grey rat gonna block you and you're gonna be left alone dealing with opponents in front of the door.
Wall Formation:
View attachment 1088015
It's a defensive wall. It's easy to lure enemies in like this, noone gonna block you either. Grey rat AOE attack gonna agro enemies, you don't have to worry about anything. You can help out if you want, but it's not recommended. Remember to never backtrack or you gonna put Cecily in danger and Grey rat AOE attack will hit you as well.
Circle formation:
View attachment 1088019
Easy to lure enemies in, noone gonna block you, Cecily gonna tanks, Grey Rat occasionally tanks and taunts. You sneak attack from behind to keep Cecily alive. Not recommended if Cecily is low on either HP or STA. Recommend a weapon with "Sap/ambush" property.
These are the most basic of formations, you can improvise and adapt to suit your need mid-battle.
If you blindly rush in, it's obvious death awaits the one without plans.