Two scenes taken from chapter 526. Luffy breaks into Impel Down for his own reasons I can't say, and seperates from Boa. He lip sych saying "THANK YOU" but Boa misunderstands and thinks he is saying "I LOVE YOU".
Well, only at the end of the series, if he figures out(Which he won't) before the series ends, then there isn't going to be a love plot. I just hope Hancock joins and that she doesn't get made at Luffy when she finds out that he onlys aid THANK YOU.