"Yeah," I stammered. "Just trying to save up for... things."
Remember: That "fine" mom? She’s also the lady who wiped your girlfriend’s butt, taught her to ride a bike, and likely sees you as a slightly annoying puppy dog. The moment you cross that line, you stop being a potential son-in-law and become a cautionary tale. My Girlfriend-s Mom Is Much Finer than Her- So ...
Keep the fantasy in the spank bank where it belongs, and go take your girlfriend out for a nice dinner. Focus on the woman who actually chose you back. "Yeah," I stammered