Math help needed (EV)

I'm going to put up $100.
My opponent is going to put up $100.

We are going to do a series of bets until one of us has all the money.

Each bet, I will get two spades in my hand, and we will lay the flop out with two spades and one non-spade (flush draw).

If a spade comes on the turn and/or river, I win. If it doesn't, I lose.

Opponent is going to wager $3 and I am wagering $1 on each bet.

We bet until one of us has all the money.

If it is me, I will give my opponent $25 back.

What is my EV?




Thanks in advance for your help.