I gotta question the intelligence of making your feet, something used all day every day, into an erogenous zone. Imagine if your primary erogenous zone were constantly stimulated. Either the senses would dull or you would constantly be getting off.
What a sweet ending. Despite it being a simple test of a new drug, he managed to use it as an opportunity to confess to her and by that end, I'm sure they'll be happily married...And from now on people might have trouble just walking anywhere since it arouses them so.