S.K.
You might think this sounds strange, but I use Irish Cream to mix with Pepsi! It is delicious. I think your Mocha liquor is along the same lines, so it might be good. My Sister & I (both Bartenders) call this drink a White Cow. Fill a glass with ice, add a few shots of the liqour, slowely add the Pepsi, it will foam a bit, so don't overfill. Stir. You could also try it with vanilla ice cream in a blender. Top with a sprinkle of cocoa powder.