It doesn't really matter how many times Larry or anyone else comes inside her, because the events are skipable and she will need to get pregnant from an event that isn't. The entire game is keeping MMC and Ellie apart and unrecognizable to each other for a reason. There is bound to be and unskippable event where they fuck like the first game had with boyfriend and Nadia on the only possible day she could get pregnant. That's why Ellie isn't black lol. Of course, this is only in the canon ending and not the various "bad" endings where this doesn't happen. We've already had a few of those. The fucked up event leading into the next game needs to be hard coded in like the first time around and as fucked up as her relationship is with Larry, Ellie getting pregnant by captain comb-over doesn't fit the bill.