Can I choose to be hit by an attack?

Question

I'm a Phoenix Bloodline Sorcerer. The Bloodline Arcana ability reads:

When casting any spell that deals fire damage, you can instead heal your targets. The spell deals no damage, and living creatures affected by the spell instead regain a number of hit points equal to half the fire damage the spell would normally deal.

Which sounds great. I know that if I use a Fireball, there is a rule that lets my party "fail" their saving throws:

Voluntarily Giving up a Saving Throw
A creature can voluntarily forgo a saving throw and willingly accept a spell’s result. Even a character with a special resistance to magic can suppress this quality.

However, I can't find a rule that lets them be "hit" by a spell like Scorching Ray (which requires a ranged touch attack) when they choose to. Is there any official rule to enable this?

Answer 1

The answer to your main question "Can I choose to be hit by an attack" is yes, you can.

The answer to your other question "Can I automatically hit an ally with a ranged attack/ranged touch attack" is no, you can't. You must roll the ranged attack/ ranged touch attack.

The rule to understand this are described on Touch spell in combat and ranged touch spell in combat as you can see below.

Touch Spells in Combat: Many spells have a range of touch. To use these spells, you cast the spell and then touch the subject.[...] You can automatically touch one friend or use the spell on yourself, but to touch an opponent, you must succeed on an attack roll.

As you can see this is specified and since specific overrule generic this means it is an exception.

Now read ranged touch spell in combat:

Ranged Touch Spells in Combat: Some spells allow you to make a ranged touch attack as part of the casting of the spell. These attacks are made as part of the spell and do not require a separate action. Ranged touch attacks provoke an attack of opportunity, even if the spell that causes the attacks was cast defensively. Unless otherwise noted, ranged touch attacks cannot be held until a later turn.

As you can see there is not specified that you can automatically hit an ally and therefore you simply must roll a ranged touch attack to land the spell against your ally.

As a personal opinion, anyway, if your ally want to be hitted by your attack he can remove his dex bonus (and other bonus like dodge etc etc).