In some weird way I still think Eku KT is not happening ..they cannot repeat KN story here again.. there are many ppl who hate that KN track to the core and Ekta has received a lot of flack for it and continues to get it..
So, these are some of the possibilities I thought might happen if LKT have to get together
1. The way L KT have been jinda lash types any idiot will get it that they have some history.. but since this is the Virani Clan we can safely say they wont see it.. they all wear horse blinders
2. This Clan also has a bad habit of eves dropping so someone will hear the final good bye speech between L KT.. Arra ra ra I hope its Daksha Chachi.. that way it will be less melodramatic and more comical
3. Eku will refuse to marry KT (Chances of this are slim since either L/KT might give him their kasam and stop him from revealing the truth)
4. Ala Hum Aapke Hai Kaun style KT will write a letter to L and return that dhaaga he gave her and in that letter mention that she is returning his love for her (just like La Dixit) .... few mins later letter falls in Tulsi G's hands and the engagement is off.. Tulsi will remember Eku's rona dhona in which he clearly says the girl he loves, loves someone else.. Tulsi ki dimag ki batti jalegi.. der se hi sahi and she will realise KT her pyari beti loves Lux international.. duh!!!
5. Archita the traitor wonder why she's not opened her mouth yet.. she knows abt LKT and has been seeing all their antics to date.. she needs to speak up.. but again I think she's bound by some crappy kasam given to her by Laksh
6. Ba gets her memory back that she and Archita told Laksh to marry KT as she suits him very well...then Ba will tell the entire engagement party to stop the Eku-KT ceremony and replace it will L-KT
7. Chandni movie style Eku KT somehow are getting engaged, Laksh falls from the steps and KT leaves the ring ceremony and runs towards Laksh.. thus revealing to everyone that her heart is with Laksh
Cant think of any more scenarios but looks like I've covered them all.. since Ekta draws inspirations from Bollywood I think any one of these can happen...