I found a manga with a scene featuring the protag fighting a giantess, whom he defeats by growing into an even bigger giant and ejaculates onto her. He’s so big compared to her his individual sperm cells act like missiles.
The manga’s name annoyingly doesn’t translate, but it’s titled “Makikomarete Isekai Teni suru Yatsu wa, Taitei Cheat”. The sequence is in the end of ch14 and mainly during chapter 15.

Best posts made by BryTheGuy
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Giant Cumshot in Manga
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[Warning: Incest] Classic SW Hentai
Dug up this old scene by Kanaisei Jitenshasougyou
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shrinkfan.com is popping out some bangers these next months
Please note I’m not affiliated with shrinkfan, I just appreciate good SW content when I find it and would like to share it.
Itty Bitty Bang Bang (available now)
Down Time 2 (releases 9/1)
Life Diminished 5 (releases 10/1)
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Split Fiction - Giants
The recent video game Split Fiction has a level where the two lady player characters climb a mountain with the help of a bunch of giants.
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Atom Smasher Comic
New Atom Smasher story came out for the Black Adam movie. It’s got some… Interesting… panel art.
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Warframe - Living Statues
Recent Warframe update added an area with a recurring theme of giant statues. There’s even a few times where they come to life and attack you.