I get the feeling that the transformation will break do to lack of mana and MC will end up defeating her and that she will fall in love with him as well (I think it's safe to assume the elf is falling for MC already)
2 things, 1 no way MC kept up with the car on foot.
2 so you just let the guy get away with attempted rape of a minor? Repeat offenders are high for that type of thing and you are letting him off with just a broken window???
here i was thinking she somehow did not notice she was naked with him and when he told her to get dressed, she would realize she was naked that whole time and get embarrassed about it.