Elena..sired??Now the real question is:

I havent watched the epi yet, but this sire whatever bond, urghh😡.. I take this as total crap from writers what & how they had turned the events just due to this bond thing but if they are going to play smart with this track, i might change my opinion😛

And in this episode, Elena being sired to Damon that's why she poured out her all feelings over him. This sired thing did played some twist with her feelings but it never looked like she was actually being grateful to Damon,so she is doing this all. Klaus hyrbids were like faithful, obedient student to him. They did whatever he said, none of his female hybrids had love feelings for him or were attracted that way. They were only grateful to klaus for putting them out of that mystery (and for that they may kill themselves if Klaus asked to). In DE's case after blood sharing or Elena turned by Damon's blood, Elena wasn't following to Damon's orders or wasnt acting to him like she owed to him anything. She had that real feelings for Damon long time ago and their realtionship has forver been on honesty nomatter how bitter the situation been for them. This blood bond thing (and being a vampire) had multiplied her feelings for Damon and made her open up & she being honest to herself.