There was an Eli x Umi
doujin uploaded earlier this year. Considering LL!'s age and the fact that EliUmi is an uncommon pairing, that's not too bad. It wasn't even either of their birthdays (I think? I don't pay that much attention to character "birthdays"... except for Nozomi because hers is 6/9 and that had to be intentional, right? Right?).
It is sad that we'll likely never see nearly as many of them as the more popular pairings (even if I do like those as well). Hopefully tMnR and others will bless us with their majesty for a long time to come.