General Reccommendations
KeitaroxKonata... very interesting pairing and a pretty good premise, I want to say that the author is pulling it off, but there are some points where he/she stumbles, which probably have turned off many readers (yes, the faux-eroge thing is top of the list).
Keitaro is not the Otaku in question... Konata is. Kei's a gamer with good rep, good standing with his guildies, solid skills at playing his favorite game with a well decked out toon; but not really an Otaku. From the opening scene he had to be almost coerced to drop his study session to get online and play.
At moments it feels like it's Kei's story at others Konata's... changing the first person perspective is not a bad thing, per se... but there are moments where you can't decide/confirm who's perspective we (the reader's) are in; even though it's mostly Kei's.
More than a romance... it's a very strong platonic relationship, almost a Bromance (come on, we all have to admit, Konata is more a Bro than a proper girly girl); that situation could change in the following chapters, but it will take a good effort from the writer; unless he decides to friendzone one or the other (Kei's studying habits kinda lampshade TouDai and possibly teh promise grrl... and Konata, might not want a deeper relationship, yet).
While no Hina Girls have appeared, it's nice to get a little "Kei before Love Hina" backstory/character development... though at this point it's more of a Keitaro getting dropped into a non-wacky episode of Lucky Star instead.
I'll toss my stock in with ragnarok1337 in that
Konata should be the one with the eroge-like decision tree, since she's the eroge fangirl and bigger otaku of the pairing, especially since she pointed it out during their first Off Line Meeting; and Kei's just too much of a nice guy to (usually) think of friendships as a game.
If anything, Keitaro would quickly work through internal self doubt and do his best in keeping the relationship with Konata as healthy and PG-13 as possible. He'd be more of the mental "should I go with OptionA... or would she like OptionB more?", but more as quick to decide and succeed/fail and roll with the punches.
Still a pretty enjoyable story even with its faults. Short and sweet... could do with a little more depth... but that's personal taste.
BTW... Why?, oh WHY?? do I imagine the following.
Years later, Konata arrives one day at Hinata Sou and starts glomping Kei just because she can... besides by then she loves hugging Kei like a big 'ol teddybear, to which Kei just doesn't freak out or klutz out at said public display of affection at all... come on, it's her best friend in the world, it's all good!
Kitsune> My my Keitaro, I knew you sometimes sneaked glances at Shinobu, but I didn't think you really were of that persusaion.
Shinobu> I have a chance!!! I knew Sempai was the perfect man for me!
Kaolla> I don't have to do the Red Moon thing to get him in the mood? Sweet!
Motoko> URASHIMAAAA!!! not only are you a pervert! but you're a LOLICON!!! *raeg!!!*
Naru> Keitarooooo! *jealousy boosters engaged, target locked*
Konata> actually...á *lets go of Kei and addresses the Hina Girls* I'm older than most of you ^^; *shows her ID to the raegoholics* Hey Kei! where's your computer? *drags him off to his room... because she'd know this by now* I wanna show you the newest Eroge I just got! It has Waitresses, Maids AND Mikos with huge boobs like Yuki-chan's!
Kitsune> oh... my... god...
Motoko> SHE perverted HIM???
Naru> *BSOD'd*
Kaolla> hey Shinomu! lend me one of your cute dresses! *starts pestering the daydreaming and nosebleeding Shinobu*
Konata> *appears at the top of the stairs, sans-ronin, addressing the Hina Girls* been trying to for years now, but he just doesn't pick up the not so subtle hints :3