I don't know of many games that have piercings linked by chains (only the first one below), but you're welcome to see if any of these games interest you:
The Princess and the Tower:
3D Cartoonish; Girls can get a variety of nipple and genital piercings, one girl will wear a nipple chain toward the end.
Where It All Began:
3D-Daz; Miru has nipple barbells, other girls have tongue and lip piercings.
Race of Life:
3D-Daz; Jasmine has nipple, tongue, navel, nose piercings.
Summer's Gone:
3D-Daz; Milf with nipple piercings, but you don't get to romance her.
Chasing Sunsets:
3D-Daz; Jaye has a navel piercing.
Being a DIK:
3D-Daz; Zoey has nipple barbells, other girls have tongue, navel, and facial piercings.
Matrix Hearts:
3D-Daz; Stormy has nipple barbells, another girl has a navel piercing.
Hillside:
3D-Daz; Lucy has nipple barbells.
Artemis:
3D-Daz; One girl has a tongue piercing, several girls have facial piercings, implied that Zelda has a genital piercing.
Bare Witness:
3D-Daz; Two girls start with nipple barbells, a third can get them later on.
Desert Stalker:
3D-Daz; One girl has a nipple and navel piercing.
Adored by the Devil:
3D-Daz; Vivienne has nipple barbells.
How to Fix the Future:
3D-Daz; Girls with tongue and navel piercings.
The Roommate:
3D-Daz; One girl has nipple barbells later in the game, several girls have navel piercings.
Long Road Home:
3D-Daz; Several girls with nipple rings, barbells, and other piercings.
iNSight of You:
3D-Other; Corrupted girls may get nipple and genital piercings.
Freeloading Family:
3D-Daz; Two girls can get nipple barbells in the last chapter.
The Unbroken:
3D-Daz; Elspeth has a navel piercing.
Female Agent:
2D VN; Female protag; Can get nipple barbells, navel piercing, and others.
Lyla's Curse:
2D VN; Female protag; Lyla gets nipple piercings, can switch between rings and barbells.
Another Chance:
2D VN; One girl has nipple barbells and a genital piercing.
Love & Sex, Second Base:
2D VN; Any of the girls can be given nose, tongue, nipple, navel, and genital piercings, each girl has a different style.
The Fixer:
2D VN; Female protag; Can get nipple rings and navel piercing.
What a Legend:
2D VN; Rose has one nipple ring.
Magical Girl Celesphonia:
2D JRPG; Female protag; Can get four types of nipple piercings.
Most of the games from
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(and some others from
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) will have nipple piercings on one or more girls, such as
PNL,
FEGNB,
BGDGU, and
HWVCDH.