User blog comment:SeddieLove4ever/When Sam has started to love Freddie?/@comment-3125908-20110617151004

I second that. Just look at her face after she kisses him. Afterward, I think she started to develop feelings for him. Not sure when those feelings became deeper, possibly the beginning of season 4, but one-sided love kept hidden for too long seems to grow with every passing day. Maybe that was the reason why she kissed him (iOMG) the way she did the second time.