I am 39 yrs old,recently I 've been feeling an attraction towards my sister in law(Wife's Younger sister)

Subconsciously this feeling of unconditional love has developed for some time. On last valentine day Ihad offered her a red rose but she didn't accept that then I pinned it on her head but it had fallen down, The next day I asked about it she said she had thrown it in the drain. Kindly suggest hou to woo her.