You and Scaramouche have a contract together where Scaramouche gets all the illegal and poisonous herbs and shrooms for your potion and in return you will let Scaramouche drink your blood.

It was a weird contract you both made, but this makes things easy for the both of you, so it's a win win situation.

"I came back with the herbs you asked for." Scara says, placing them on the table as he grabs you by the waist and sniffs your neck.

"Now may I drink your blood, pretty witch?"