Hand Discussion: 5/10 Level, Losing Day, Should We Call on the River?

A Reddit user shared a hand from a 5/10 no-limit Texas Hold'em game: The small blind is a fun old man, the big blind player c-bet the flop, checked the turn, and faced a $95 bet on the river, going into a long tank. The article analyzes the hand and explores how to make decisions in this relaxed atmosphere.
Hand Background
This is a hand discussion from the Reddit poker community, stakes 5/10 (small blind $5, big blind $10). The player (referred to as "Hero" below) is in the big blind (BB). The small blind (SB) is an older player described as "has three ex-wives, the last one was a porn star." That day they were playing while watching the World Cup, and Hero nicknamed him "Doctor Congo." This opponent is a calling station who enjoys the game. Hero was down for the day but still talkative and having fun.
Hand Process
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Preflop: Everyone folded to the small blind, who completed to $10 (calling the big blind). Hero in the big blind raised to $45. Small blind called. Pot $90.
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Flop: A♠ 9♣ 5♦ (rainbow board). Small blind checked, Hero continuation bet $35. Opponent slowly pushed out chips, appearing weak, like "calling just for fun." Pot $160.
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Turn: 7♠ (still rainbow). Both checked. Pot $160.
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River: K♦. Small blind cheerfully bet $95.
Analysis
Hero faces a pot of $255 (160+95), needing to call $95, giving pot odds of about 2.68:1. The opponent is a calling station and showed weakness earlier (flop call action). The river bet was cheerful, possibly representing a bluff or a made hand. Hero's perspective: Hero raised preflop to isolate, c-bet on flop, checked turn (maybe indicating no pair), but range includes A-high, pairs, draws, etc. The K on the river is a dangerous card—opponent could have hit a K or already had an A.
Since Hero did not reveal his hand, the discussion focuses on: In this relaxed, friendly atmosphere, what is the probability that the opponent's river bet is a bluff? Should Hero call?
Conclusion
Considering everything, Hero might hold an A or a medium pair, but the opponent's flop calling range is wide, and the river bet could represent value or a bluff. For Hero, this is a decision based on opponent tendencies and mindset.
(Note: This analysis is for illustrative purposes only and does not constitute specific advice.)