I'm another who doesn't get an anal vibe with this VN, although I also didn't expect inflatable Sophia as a fulfilment of what passes for tween/teen norms these days, ["Oh Yeah, gimme those Mommee milkers," is a quote from elsewhere in F95, presumably from somone on the young side....at least I hope they're still young!], so who knows, can anal really be ruled out? It's very common, at least in 3D renders. Sometimes it seems almost obligatory. If it does occur, some things come to mind.
First, given past form, I would expect objections & not necessarily from the same fans who are anti-blackmail but possibly along the same lines, if it happens to Sophia. That's assuming it isn't performed by Aiden or Bennett, of course. If it does fall to one of those chaps there'll be a firestorm, (although I wouldn't care about that personally).
Second is the realism factor, which is normally lacking in the act's 3d depiction. Plenty of lubrication is required for a start, especially for those persons not habitually indulging in this kind of intercourse. Many illustrations show some discomfort for the receiver, if they show any at all. It is neither a quick, nor easy act & is equally painful for the giver. Men's organs are not made of iron, however hard they might become & the only people able to "give & take it up the arse" with relative ease are porn stars with a ton of experience.
Third, it's not something that happens that much in the early stages of a relationship, or in one which is not strictly approved by society like an extra-marital affair but it's the kind of thing more within the range of well-established couples. Someone treading on eggshells conducting a relationship, perhaps with a married woman, having clandestine meetings, often brief, IMO is unlikely to ask, "would you like it up the arse tonight darling?", or, "we've got 15 minutes, let's do anal."
Overall, I believe it to be a young man's fantasy, realisable through the 3D medium & that the majority who depict it have never done it in their lives, as confirmed by how it's shown. It has a lot of fans & they might well facepalm this post but I'd then assume that they also have never done it. Those who have will know that what I'm saying is true.
Cue a number of posts along the lines of, "WTF, I do it every night without lube.....", etc., etc.