Elsa felt a little twinge in her heart when he said 'if she could fit him'. Carlos' cock was bigger than Brendan's...and she could fit him all the way down her throat. But she didn't mention Carlos' size to Brendan ever, so there was no way Brendan could know that, nor did she want him to know that. She gave him another loud moan and finally pulled him into her throat, letting him press against her throat muscles.