I made it!!
I really like its texture but the protein powder ruined it...
I used whole food's vanilla whey protein and it tastes kinda weird...but acceptable( i wouldnt let anyone taste it though haha...have to finish the whole loaf myself )

I didnt use lemon extract and used like 3 tbps of lemon juice..it turns out there's no lemon flavor at all...I guess the lemon taste really has to be lemon extract right?

next time Im going to replace the whey protein powder with coconut flour ~!
and i plan to replace half of the butter with strawberry sauce !!
let's c how it turns out