Your lover has been tinkering a little bit with your brain by making certain activities, foods and words arousing to you based on associations they've been building with you over time. This one is kind of fun and light in tone (though as I was tagging this, I am very inclined to do a much darker version of this idea as well). I've been fucking with your brain a little bit to make you horny. I hope you don't mind hehehe.