 If you liked
Kokoro Button
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 ...then you might like
Ookami Shoujo to Kuro Ouji
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In both these manga; the main leads aren't actually going out at first and the male lead likes to tease the heroine.
Main girl = Masochist
Main guy = Sadist
The main girl in both manga are the only ones that are aware that the lead guy is a S.Quick relationship.
Difference
Kokoro Botan - Lead guy enjoys teasing the lead girl
OStKO - Lead guy is more of a Tsundere
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If you find that lead guy in Kokoro Botan not S enough, you will definitely like OStKO.
If you find the lead guy in OStKO a bit too much, you may like Kokoro Botan as I feel that the lead guy in Kokoro Botan knows the limit.