You can easily do that when your starting to go up to the villa and then a cut scene will
happen where Lumina and Rock are talking to each other, He tells her that Sebastian, (The
Butler) wears a toupee, Lumina suddenly asks you does he and you say ''no'' that will
boost Rocks love to you up to 4, It may happen in late spring or early summer, remember
though you have to start going up to the villa where Romana, Sebastian and Lumina lives,
if not than it will not happen and you won't easily get Rocks love, but it really doesn't
matter you don't need to see it, you just have to get the hearts up to either 5 or 6, me
personally think that the best person to marry is Gustafa, hes sweet, down to earth and
always honest hes really cute and I love that big green hat with the flower on top, also
just because Rock seems like the cutest, he really isn't its not quite a challenge 'cause
he is already your friend and that won't take too long, plus he only has about 2 cut
scenes and than you give him a blue feather and voila your married in Spring, also when
you show him your little boys drawing he says ;;Ew, all gross in other words I don't like
it.'' So stick with Gustafa kid and you will live a happy life!
Hope I helped! :)
Remember what I said stick with Gustafa, plus Rock is always up and he never goes to bed
and he's always complaining when you bring the kid home at 9:00pm, he is so selfish and
that's why I like to stick with Gustafa.

Sorry, I wrote you a whole book, but when I get into writing something I just can't stop!

Hope I helped again :X